Why can cosmetics cause adverse reactions in the end? A: there are some special additives in the ingredients of cosmetics. Mercury, lead, arsenic and other heavy metals are the real culprits of cosmetics poisoning or adverse reactions. We all don't know enough about mercury, lead and arsenic. When you choose cosmetics, it seems that you are attracted by the beauty of cosmetics and don't pay attention to its real essence. In addition, preservatives, pigments, some enzymes and heavy metals can cause adverse reactions, the most important of which is the over standard of heavy metals. Health tips: basic raw materials of cosmetics: colloid, protein, starch, oil special additives: preservatives, fungicides, vitamins, enzymes, pigments, etc. What other problems will occur besides those caused by excessive mercury in cosmetics? The harm of excessive mercury to human body: 1. It will lead to depigmentation; 2. Skin irritation; 3. Skin damage; 4. It will cause accumulation in the body, which will cause various adverse reactions in the body. The most important thing is the central nervous system, such as insomnia, weakness, poor memory, especially the change of mood. What problems does lead bring to human body? Answer the harm of lead to human body besides having an effect on the skin, still can cause the expression of neurasthenia, after absorbing additionally, digestive system also can have a few symptoms, for example constipation, inappetence is not good, severe word, liver function may have damage. The harm of arsenic to human body? The toxicity of arsenic is also very great. If it is absorbed after use, arsenic will also cause changes in the nervous system. At the same time, there are some changes in the peripheral nerves, such as hand numbness, numbness of feet and limbs, pain and other symptoms. There may be melanosis and pigmentation on the skin.